Inch to Kilometer

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Result

2.54e-5

km

Conversion rate: 1 in = 2.54e-5 km

Showing up to 4 decimal

How it works

The converter uses exact SI-based factors (e.g., 1 foot = 0.3048 meters, 1 inch = 0.0254 meters).

Formula: kilometers = inch × 0.0000254

Results show between 0 and 8 decimal places and hide trailing zeros for readability.

Conversion Table

Inch Kilometer
0.001 in 2.54e-8 km
0.01 in 2.54e-7 km
0.1 in 0.00000254 km
1 in 0.0000254 km
10 in 0.0003 km
100 in 0.0025 km
1000 in 0.0254 km

History

Inch (in)

The inch, abbreviated as in, is a length unit in the imperial and US customary systems. Its history reaches back to ancient civilizations, including the Romans, Egyptians, and Anglo-Saxons. Originally, the inch was determined by the width of a human thumb, but it was eventually set as 1/12 of a foot. Since 1959, the inch has been officially defined as exactly 2.54 centimeters due to an international agreement. Inches are still widely used in the United States, Canada, and the UK, especially for construction, manufacturing, and personal measurements. Even with the global shift to metric units, the inch remains important in certain fields such as technical drawings, screen dimensions, and household tools.

Kilometer (km)

The kilometer, or km, is a unit in the metric system that equals 1,000 meters. It was established as part of the metric system during the French Revolution and soon became the default for measuring longer distances. The word “kilometer” is derived from the Greek for “thousand” (chilioi) and “measure” (metron). Kilometers are widely adopted for measuring travel distances, geographic features, maps, and sporting events in most countries. In contrast, the mile is still used in countries like the United States and the UK. The kilometer’s decimal structure makes calculations simple and has been essential to transportation planning, GPS technologies, and international measurement standards.

Other Relevant Conversions

m → cm m → mm m → km m → in m → ft m → yd m → mi m → µm m → nm cm → m cm → mm cm → km cm → in cm → ft cm → yd cm → mi cm → µm cm → nm mm → m mm → cm mm → km mm → in mm → ft mm → yd mm → mi mm → µm mm → nm km → m km → cm km → mm km → in km → ft km → yd km → mi km → µm km → nm in → m in → cm in → mm in → km in → ft in → yd in → mi in → µm in → nm ft → m ft → cm ft → mm ft → km ft → in ft → yd ft → mi ft → µm ft → nm yd → m yd → cm yd → mm yd → km yd → in yd → ft yd → mi yd → µm yd → nm mi → m mi → cm mi → mm mi → km mi → in mi → ft mi → yd mi → µm mi → nm µm → m µm → cm µm → mm µm → km µm → in µm → ft µm → yd µm → mi µm → nm nm → m nm → cm nm → mm nm → km nm → in nm → ft nm → yd nm → mi nm → µm